Glossary of Terms

Airfoil Terminology

Stall

Reduction in the lift coefficient generated by an arifoil as angle of attack increases. This occurs when the airfoil's critical angle of attack is exceeded.

Spanwise Pumping

The primary cause of of efficiency loss in all rotating systems.

Tip Stalling

When a wing tip stalls before a wing root.

Tubercle Technology™

This is the additions of tubercles (or 'bumps') to the leading edge of an airfoil that directly addresses the fundamental limitations of conventional aerodynamic performance.

Ventilation Terms

Stratification

Hot air rising, creating a heat gradient differential from floor to ceiling.

Destratification

The elimination of stratification (see above).

Natural Ventilation

This is the process of supplying and removing air through an indorr space by natural driven means. there are two types of natural ventilation; wind driven and stack driven.

Non-Disruptive Airflow

Constantly moving large masses of air (gently) throughout the space, without disruptive breezes negatively effecting the functioning space.

HVLS

High Volume, Low Speed, refers to the altra-air Fans's ability to move a high volume of air, while operating at a very low speed; a classification of fans.

Terms of Measurement

cfm

Cubic Feet per Minute is a measurement of airflow.

Conversion factor for cfh to cfm is 0.0166667.

l/s

Litres per Second is a measurement of airflow.

Conversion factor for m3/h to l/s is 0.0277778.

Ambient Temperature

Simply refers to the temperature of the surroundings.